Do I have a right to be upset?

Yes, you do, the medicine comes first. Strep throat is important to fight.

The "right" to be upset? Over some sore throat meds? Really?

Strep throat can be deadly, though some strains are worse than others.

https://www.thestar.com/news/canada/2017/03/23/manitoba-mom-loses-three-limbs-after-developing-rare-strep-throat-infection.html

http://www.foxnews.com/health/2017/03/20/dangers-strep-throat.html

http://abc7chicago.com/health/woman-loses-fingers-toes-to-strep-throat/1811001/

Me, I was quarantined for two weeks with the scarlet fever version of Strep throat.

I feel strongly that the meal can wait a small bit; I say this with a degree in bacteriology, albeit from years ago. Get the meds working already.

It was the "right to be upset" concept that I was puzzled about. What's that all about? Also, if he was so bloody sick, how come he went to the meal? (I take it he did?)

Why couldn't the dinner be delayed? You needed to get the antibiotics in your system.

Don't know why you'd get upset over a suggestion. You'd certainly have the right to say no.

I didn't take it that he went to the meal. I rather doubt it. I suppose that is possible.

I think, without googleing, that strep can move to rheumatic fever. I remember that (I was twelve) that was a big worry.

Those scary links I posted are, of course, not the norm, though real.

The British National Health Service advice page for streptococcal infections says:

Also,

So over here you'd go to the doctor if it was very severe, or had been persisting for some time. If these things were true in the original poster's case, then my view would be the family meal can go hang, I'm getting my medication right now.

I vividly remember my first wife's attitudes toward illness, especially mine. It was basically "there's nothing wrong with you". The day after I got stung by a wasp on the hand, I felt really dizzy. It seemed like the floor was tilting. I felt really strange and sick. I got no sympathy from her. She said I was being dramatic. I just walked out and took a bus to the hospital. The doctor said the wasp must have been somewhere very dirty, as I had a severe lymph node infection which needed immediate antibiotic treatment. He then called in some nurses to look at me as he said it was a text-book case. I think it was shortly after that I began thinking about leaving my first wife.

Yes. You should be upset with your wife and your parents. They should have cancelled the restaurant reservation, waited for your medication and then bought take-aways and kept you company at home. I assume it was you that your parents particularly wanted to see, not your wife.

Yes surely, You have the right to be upset. But one should not be angry on someone for more time. If you forgive some one, then they will also forgive you, if you are wrong sometime.